package 多线程;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.TimeUnit;

/**
 * @Author: biubiu0002
 * @Date: 2021-03-29 12:54
 **/
public class WaitNotify {
    static boolean flag = true;
    static Object lock = new Object();

    public static void main(String[] args) throws InterruptedException {
        Thread waitThread = new Thread(new WaitThread(),"WaitThread");
        Thread notifyThread = new Thread(new NotifyThread(),"NotifyThread");
        waitThread.start();
        TimeUnit.SECONDS.sleep(1);
        notifyThread.start();

    }


    static class WaitThread implements Runnable{


        @Override
        public void run() {
            //加锁 拥有lock的Monitor
            synchronized (lock){
                while(flag){
                    System.out.println(Thread.currentThread()+"flag is true. wait @"+
                            new SimpleDateFormat("HH-mm-ss").format(new Date()));
                    try {
                        lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                }
                //条件满足时，完成工作
                System.out.println(Thread.currentThread()+"flag is false. running @ "+
                        new SimpleDateFormat("HH-mm-ss").format(new Date()));

            }


        }
    }

    static class NotifyThread implements Runnable{
        public void run(){
            //加锁，拥有lock的Monitor
            synchronized (lock){
                //获取lock的锁，然后进行通知，通知时不会释放lock的锁
                //直到当前线程释放了lock口，waitTHread才能从wait方法中返回
                System.out.println(Thread.currentThread()+"hold back. notify @"+
                        new SimpleDateFormat("HH-mm-ss").format(new Date()));
                lock.notifyAll();
                flag=false;

            }

            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
//            再次加锁
            synchronized(lock){
                System.out.println(Thread.currentThread()+"hold back again. sleep @"+
                        new SimpleDateFormat("HH-mm-ss").format(new Date()));
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }


        }

    }

}
